à¤Ã×èͧÁ×ÍÇÑ´ à¤Ã×èͧÇÑ´ÍسËÀÙÁÔ Thermo-Hygrometer à¤Ã×èͧÇÑ´¤ÇÒÁª×é¹ à¤Ã×èͧÇÑ´áʧ à¤Ã×èͧÇÑ´àÊÕ§ > DT-8820 : 4 in 1 digital Multifunction Environment Sound Meter / Light / Temperature / Humidity Meter ST-8820 / DT-8820 : 4 in 1 digital Multifunction Environment Meter ¤Ø³ÅѡɳТͧ ST-8820 / DT-8820 : 4 in 1 digital Multifunction Environment Meter The 4 in 1 digital Multifunction Environment Meter has been designed to combine the functions of Sound Level Meter, Light Meter, Humidity Meter, and Temperature Meter. It is an ideal Multifunction Environment Meter Instrument with scores of practical applications for professional and home use. The Sound Level function can be used to measure noise in factories, schools, offices, home, etc, checking acoustics of studios, auditoriums and hi-fi installations. The Light function is used to measure illuminance in the field. It is fully cosine corrected for the angular incidence of light. The light sensitive component used in the meter is a very stable, long life silicon ciode. The Humidity/Temperature use a humidity/semiconductor sensor and K type thermocouple. Features 4 in 1 for Light meter, Sound level meter, Humidity/Temperature meter. • 3 ½ large LCD display Data Hold and Max Hold Auto Power Off “OL” Over-range indication “BAT” Low battery indication Specifications Temperature: -20 ~ 750 Deg.C / -4 ~ 1400 Deg.F Light : 20, 200, 2000, 20000(2000 x 10 Lux) Humidity: 35%~95%RH Sound Level: 35dB~100dB Size(HxWxD): 251mm x 63.8mm x 40mm Weight: 250g CEM DT-8820 Humidity Light meter Lux meter ST-8820 Temperature ÇÑ´ËÅÒ¤èÒã¹à¤Ã×èͧà´ÕÂÇ à¤Ã×èͧÇÑ´¤ÇÒÁà¢éÁáʧ à¤Ã×èͧÇÑ´ÍسËÀÙÁÔ ¤ÇÒÁª×é¹ à¤Ã×èͧÇÑ´áʧ Ẻ¾¡¾Ò